Jacked Factory Burn-XT Thermogenic Fat Burner
270mg caffeine, Capsimax cayenne extract, green tea EGCG, acetyl L-carnitine, black pepper extract. Fully transparent label with clinical doses. ~$0.67/serving. 60 capsules per bottle.
- Fully transparent label with no proprietary blends
- Clinical doses of proven thermogenic ingredients
- Excellent value at ~$0.67 per serving
- Strong energy and focus without jitters
- 270mg caffeine may be too high for stimulant-sensitive users
- Only 30 servings per bottle (2 capsules/day)
Quick Verdict
Jacked Factory Burn-XT is the best overall thermogenic fat burner for men who want clinical doses of proven ingredients at an honest price. It delivers a potent 270mg caffeine punch alongside Capsimax, green tea extract, and acetyl L-carnitine — all with a fully transparent label. No proprietary blends, no filler, no mystery doses. At roughly $0.67 per serving, it undercuts most competitors while outperforming many of them on ingredient quality. 4.4/5.
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What Is Burn-XT?
Jacked Factory is a sports nutrition brand that built its reputation on one principle: fully transparent labeling. Every ingredient, every dose, printed right on the label. In a fat burner market drowning in proprietary blends and pixie-dusted formulas, that alone makes Burn-XT stand out.
Burn-XT is a stimulant-based thermogenic fat burner designed to increase metabolic rate, enhance energy and focus, and support fat oxidation during a calorie deficit. It’s not a magic pill — no fat burner is — but it’s a well-formulated tool for men who are already training and eating in a deficit and want an extra edge.
The formula centers on five key active ingredients: caffeine anhydrous (270mg), Capsimax cayenne pepper extract, green tea extract standardized for EGCG, acetyl L-carnitine (ALCAR), and BioPerine black pepper extract. Each serves a distinct role in the thermogenic and fat-oxidation process, and each is dosed at levels that actually align with clinical research — a rarity in this category.
Jacked Factory manufactures Burn-XT in a cGMP-certified facility in the United States, and the product is third-party tested for purity and potency. The brand has been around since 2014 and has built a loyal following primarily through Amazon, where Burn-XT is consistently one of the top-selling fat burners.
Key Features & Specs
| Spec | Detail |
|---|---|
| Caffeine Per Serving | 270mg (anhydrous) |
| Capsimax | 50mg cayenne pepper extract (2% capsaicinoids) |
| Green Tea Extract | 450mg (standardized for EGCG) |
| Acetyl L-Carnitine | 700mg |
| BioPerine (Black Pepper) | 5mg (95% piperine) |
| Serving Size | 2 capsules |
| Servings Per Container | 30 |
| Price Per Serving | ~$0.67 |
| Proprietary Blends | None — fully transparent label |
| Manufacturing | cGMP-certified, USA, third-party tested |
Ingredient Breakdown
Caffeine Anhydrous (270mg): The primary driver of energy, focus, and acute thermogenesis. At 270mg, this sits just below the amount in a large Starbucks coffee (~330mg for a grande Pike Place). Research consistently shows caffeine increases metabolic rate by 3–11% in a dose-dependent manner, with most studies using 200–400mg. Burn-XT’s 270mg lands in the sweet spot for most men — potent enough to feel, not so high that it causes anxiety or crashes in most users.
Capsimax (50mg): This is a patented, beadlet-form cayenne pepper extract delivering 2% capsaicinoids. The beadlet technology is important — it releases the capsaicinoids in the intestine rather than the stomach, avoiding the burning sensation of raw cayenne. Research published in Open Heart and Bioscience Reports has shown that capsaicinoids can increase energy expenditure by approximately 50 calories per day and enhance fat oxidation. It’s not a dramatic effect, but it’s a legitimate, clinically supported one.
Green Tea Extract (450mg, EGCG): Epigallocatechin gallate (EGCG) is the most studied catechin in green tea. It works synergistically with caffeine to enhance thermogenesis and fat oxidation. A meta-analysis in the International Journal of Obesity found that the caffeine-catechin combination increased energy expenditure by roughly 5% over 24 hours. The 450mg dose in Burn-XT delivers a meaningful amount of EGCG.
Acetyl L-Carnitine (700mg): ALCAR plays a role in fatty acid transport into mitochondria for oxidation. It also crosses the blood-brain barrier and has mild nootropic effects, contributing to the focus component of the formula. While carnitine supplementation benefits are most pronounced in those who are deficient (common in vegetarians and older adults), the 700mg dose is a reasonable amount supported by research.
BioPerine (5mg): A patented black pepper extract standardized to 95% piperine. Its role is to enhance the bioavailability of other ingredients, particularly the green tea catechins and capsaicinoids. Studies show piperine can increase absorption of certain compounds by 30% or more. It’s a small but smart inclusion.
Pros & Cons
What We Like
- Full label transparency: Every ingredient and every dose is disclosed. In a fat burner market where most products hide behind 500mg proprietary blends containing 10+ ingredients, Burn-XT’s openness is genuinely refreshing. You know exactly what you’re putting in your body.
- Clinical-range dosing: The caffeine, green tea extract, and Capsimax are all dosed within ranges shown effective in clinical research. This isn’t a label-decoration formula — the ingredients are present in amounts that actually do something.
- Excellent value: At roughly $0.67 per serving, Burn-XT costs less than a cup of coffee while delivering a complete thermogenic stack. Competitors like Cellucor SuperHD and Hydroxycut Hardcore Elite cost 25–50% more per serving.
- Clean energy: Despite the 270mg caffeine, most users report smooth, sustained energy without the crash or jitters common with cheaper caffeine-heavy fat burners. The ALCAR and green tea extract appear to modulate the caffeine curve effectively.
What Could Be Better
- High caffeine content: At 270mg per serving, this is not suitable for men who are sensitive to stimulants, who consume significant caffeine from other sources, or who work out in the evening. If you’re already drinking 2–3 cups of coffee daily, adding 270mg on top could push you into anxiety and sleep disruption territory. For stimulant-free fat burning, see our Lean-XT review.
- Only 30 servings per bottle: At 2 capsules per serving and 60 capsules per bottle, you get a 30-day supply. Many competitors offer 40–60 servings per bottle. You’ll need to reorder monthly, though the low price mitigates this.
How It Compares
Burn-XT’s closest competitor is Cellucor SuperHD, which takes a different approach by combining moderate caffeine (160mg) with nootropic ingredients for focus. SuperHD is a solid option if you want less stimulation and a mental clarity component, but it costs more per serving (~$0.83) and uses a proprietary blend for some ingredients. Burn-XT wins on transparency, caffeine potency, and value.
For men who want to avoid stimulants entirely, Jacked Factory’s own Lean-XT is the best alternative. Lean-XT shares several ingredients with Burn-XT (ALCAR, green tea, black pepper) but removes the caffeine and adds forskolin. You can also stack Lean-XT with Burn-XT — taking Burn-XT in the morning and Lean-XT in the evening — for 24-hour fat-burning support without evening stimulants.
Compared to budget options like Hydroxycut Hardcore, Burn-XT uses cleaner ingredients at disclosed doses. Hydroxycut relies heavily on caffeine with proprietary blend fillers, while Burn-XT gives you exactly what the label says. The small price premium over Hydroxycut is absolutely worth it.
See our full Best Fat Burners for Men 2026 guide for a complete comparison of all our top picks.
Who Should Buy Burn-XT
- Men who want a no-nonsense thermogenic with clinically dosed, transparent ingredients
- Anyone who responds well to caffeine and wants a fat burner that doubles as a pre-workout energy boost
- Budget-conscious lifters who don’t want to pay premium prices for basic thermogenic ingredients
- Men who are already in a calorie deficit and training consistently — Burn-XT amplifies the fat-loss process that’s already in motion
Who Should Skip It
- Stimulant-sensitive individuals or anyone who experiences anxiety, heart palpitations, or insomnia from caffeine (try Lean-XT instead)
- Men who already consume 300mg+ of caffeine daily from coffee, pre-workouts, or energy drinks — stacking would push total intake too high
- Anyone looking for a miracle pill — Burn-XT works alongside diet and exercise, not in place of them
- If you work out in the late afternoon or evening, the 270mg caffeine could interfere with sleep quality
Where to Buy
Burn-XT is primarily sold on Amazon, where it consistently ranks among the top-selling fat burners. It’s also available directly from jackedfactory.com. Amazon Subscribe & Save often shaves an additional 5–15% off the already competitive price. Availability at brick-and-mortar supplement stores like GNC is limited — Amazon is your best bet for pricing and availability.
Check Current Price on AmazonFrequently Asked Questions
How much weight can I lose with Burn-XT?
Burn-XT is a thermogenic aid, not a weight loss guarantee. Realistic expectations: the thermogenic effect of its ingredients may help you burn an additional 50–100 calories per day. Over a month, that could translate to roughly 1–2 extra pounds of fat loss, assuming diet and training are dialed in. The bigger benefits are the appetite suppression and energy boost, which help you stay consistent with your deficit.
When should I take Burn-XT?
Take 2 capsules with a glass of water, preferably 15–30 minutes before breakfast or your morning workout. Due to the 270mg caffeine content, avoid taking it after 2 PM to prevent sleep disruption. Some users split the dose (1 capsule in the morning, 1 at lunch) to extend the energy effect, though this isn’t the official recommendation.
Can I stack Burn-XT with a pre-workout?
Be extremely cautious. Most pre-workouts contain 150–300mg of caffeine. Stacking with Burn-XT’s 270mg would put you at 420–570mg total caffeine, which exceeds the FDA’s recommended daily limit of 400mg. If you want to combine them, use a stimulant-free pre-workout or take Burn-XT as your pre-workout instead.
Can I stack Burn-XT with Lean-XT?
Yes, this is one of Jacked Factory’s most popular stacks. Take Burn-XT in the morning for its stimulant-driven thermogenic effects, then take Lean-XT in the afternoon or evening for continued fat oxidation support without additional caffeine. The two products share some ingredients (ALCAR, green tea) but don’t overlap in ways that would cause problems.
Does Burn-XT contain any banned substances?
No. Burn-XT is manufactured in a cGMP-certified facility in the USA and contains only legal, widely-studied ingredients. The fully transparent label means you can verify every ingredient with your doctor or a banned substance database. However, it does not carry Informed Sport or NSF Certified for Sport certifications, so competitive tested athletes should verify independently.
Will Burn-XT work without exercise?
The thermogenic ingredients will mildly increase calorie expenditure regardless of activity level. However, the real-world fat loss difference without exercise and a calorie deficit will be negligible. Think of Burn-XT as an accelerator, not a replacement for the fundamentals. Diet is roughly 80% of the fat loss equation, training is 15%, and supplements like Burn-XT are the remaining 5%.
Is 270mg of caffeine safe?
For most healthy adults, yes. The FDA considers up to 400mg of caffeine per day generally safe for healthy adults. At 270mg, Burn-XT is within that limit even with a small cup of coffee. However, individual tolerance varies widely. Start with 1 capsule (135mg caffeine) for the first few days to assess your response before moving to the full 2-capsule dose.
Final Rating: 4.4/5
Jacked Factory Burn-XT is the fat burner we recommend most often because it does exactly what a thermogenic should do — deliver proven ingredients at honest doses for a fair price. The fully transparent label sets it apart in a category plagued by proprietary blends and under-dosed formulas. The 270mg caffeine provides real energy and thermogenic effect, and the supporting cast of Capsimax, green tea extract, and ALCAR is well-chosen and well-dosed.
It’s not perfect. The caffeine is too high for some, the 30-serving bottle means monthly reorders, and it won’t replace the fundamentals of diet and training. But as a supplement that lives up to its name and its label, Burn-XT is the best thermogenic fat burner for most men in 2026.
See Today's Price on AmazonLast updated: February 2026. We re-evaluate our reviews regularly based on formula changes, pricing, and reader feedback.
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